TDL will debut the new special event "Lilo and Stitch Big Panic: Find Stitch!" on it's 23rd anniversary day April 15th, 2006 and will run thru the springtime months until July 13th, 2006
The info on TDR's official site reads as follow:
"" Coming Soon!
Lilo & Stitch's Big Panic "Find Stitch!"
April 15 through July 13, 2006
Stitch from Disney's Lilo & Stitch has decided to make all the Guests part of his O'hana, or "family" in Hawaiian. But when he tries to decorate the Park to welcome them, Stitch makes some big mistakes and runs away! Join the fun as the Disney characters create a huge parade to try and find Stitch with the help of a swarm of Stitch's alien "cousins."""
Seems this will be a new parade in addition to the regular parades now offered at the park. Stay tunes for more info as it becomes avail.